CVE-2021-42663 json
An HTML injection vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP/MySQL via the msg parameter to…
published 2021-11-05 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-29624
- cvss
- 4.3
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 3.9%
- EPSS 3.9% chance of exploitation in 30 days, percentile 90%
- public exploits
- 0
- none known, plus a Nuclei check
Summary
An HTML injection vulnerability exists in Sourcecodester Online Event Booking and Reservation System in PHP/MySQL via the msg parameter to /event-management/index.php. An attacker can leverage this vulnerability in order to change the visibility of the website. Once the target user clicks on a given link he will display the content of the HTML code of the attacker's choice.
Exploit prediction
3.85% chance of exploitation in the next 30 days, higher than 90% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- Nuclei template Sourcecodester Online Event Booking and Reservation System 2.3.0 - Cross-Site Scripting nuclei detection template
- github.com https://github.com/TheHackingRabbi/CVE-2021-42663 referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 4.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N |
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:P/I:N/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
-
github.com
/TheHackingRabbi/CVE-2021-42663
exploit, third-party-advisory
-
sourcecodester.com
/php/14241/online-event-booking-and-reservation-system-phpmysql.html
product, third-party-advisory
Sources
- CVE List CVE-2021-42663
- NVD CVE-2021-42663
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